Malicious PDF — malware analysis report

Static analysis result for SHA-256 06aaa37df5b0354a…

MALICIOUS

PDF

64.7 KB Created: 2020-08-30 22:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef948da7cac052d877758bc2a3abfd89 SHA-1: a89e9b4638f348a769390d7ffb1efe006ac90351 SHA-256: 06aaa37df5b0354affd633612062e8901eddf62da2199c47d08b7c04be41d41c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to benign content, but one critical link directs to a known malicious redirector. The document body, though heavily corrupted, contains the same malicious URL and appears to be a lure for a Spanish cookbook. This suggests the document is part of a link farm or SEO poisoning campaign designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wix?keyword=libro+de+cocina+espa%25C3%25B1ol
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/008e52_dc449332d43641c4a43d3800fc03fdb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_7492fa46f0884664b73071ecbe1ce725.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa1ed2993df2487d960fe704b1703569.pdf
    • https://static.usrfiles.com/ugd/b8c837_7093ddc8f9744b2aac5c360e0eaceeec.pdf
    • https://static.usrfiles.com/ugd/9757e7_b16807c8a3114ee3bc30286e39fc9190.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7a530376ed044569bc785c75646b4e6.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/11358352535.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86562581376.pdf
    • https://cdn.shopify.com/s/files/1/0435/1796/8543/files/fujibaluped.pdf
    • https://cdn.shopify.com/s/files/1/0433/9902/0696/files/rotefisawisatumuwup.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9766/files/jogimadojinojuxed.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b049.bin
9165a7c1ffa1979064620b528c884aaa067037a0f31da835c3deb018edca0727
pdf-font-stream PDF embedded font (sfnt) at offset 0xB049 5068 bytes
font_01_sfnt_off0000c12e.bin
348c614615ae48ecc6cbe193a8958fe9fd951c6977b8f5fbc3ce9e63bf59c7d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC12E 11564 bytes
font_02_sfnt_off0000e6b1.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 4324 bytes